Electric headlight-lamp.



' No. 629,631. Patented July 25, |899; H. P. wELLMAN. l

ELECTRIC HEADLIGHT LAMP.

Y (Application filed Apr. '6, 1899.1 I (No Model.) 2 Sheets-Sheet I.

TH: Ncnms paens co. Pnomumo.. wnsnmmom u. c.

No. 629,63l.

(No Model.)

H. P. WELLMAN.

ELECTRIC HEADLIGHT LAMP.

(Appucation med Apr. e, 1899.

Patented July 25, |899'.

2 Sheets-sheet 2.

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UNITED! STATES 1 PATENT. Orrlcn- `HABLAN P; WELLMAN, or ASHLAND, KENTUCKY.,

ELECTRIC HEAoLieHT-LAM-P. l

SPECIFICATION `refilling part of Letters ratentlvo. 622x631, dated July 25, 1899. -f

-l .Application tiled Aprile, 1899. serial no. vl'aoo. (No model.) f

T @ZZ whom t may concernf Be it known that-,1, HARLANP. WELLMAN, of Ashland, in the county of Boyd and State of Kentucky, have invented certain new and useful Improvements i'nElect-ric Headlight- Lamps; and I do herebydeclare the following to be a full, clear, and exact descriptionof thel invention, such as will enable others skilled in the art to which it' appertains to make and use the same. f

This invention contemplates certain ynew and useful improvements in electric headlight-lamps for electric-railway cars, ybeing specially applicable to those operated by an alternating current. l

The primary object of the invention is to provide a lamp which maybe operated by and connected to thepowercircuit of an electricrailway car without the annoyance and encumbrance of connecting Wires and plugs as commonly employed.

A further object is to provide a lampin which a highly-charged vacuum-tube located at or near-'the focal point of a reflector is the illuminating medium.

The embodiment of my invention contemplates the employment of primary and secondary coils similar to those of a transformer or converter, the coils being separable and so arranged that when the lamp is properly positioned an electromotive force or current will be generated in the secondary coil through the inductive effect of the alternating or interrupted current circulating through lthepriA mary coil. The latter .is located on the car, preferably on the dash, While the secondary coil is carried by the lamp. In circuit with the secondary coil is a vacuumtube, or in lieu thereof arc-carbons may be employed or an incandescent lamp. The invention will be hereinafter fully set forth, and particularly pointedv out in the claims. f Y

, In the accompanying drawings, Figure 1 is a view, partly in section and with parts broken away, showing my improved lamp. Figs. 2, 3, 4, and 5 are views showing various modi.- iications. In Figs. 2 and 3 are clearly shown arc-carbons, and in Fig. 4 an incandescent lamp. Fig. 6 shows a form of connnection between the cores of the coils.

Referring to the drawings, Adesignates the i' vlamp-casing, which is shown as'supported by vhangers a from the car-dash. a. The lamp may, however, be located at any desired pointy on'a car-body, although commonly suspended from thedash. f

B is a primarycoll, which is located in protective. housing b, attached to the front of the dash an'. The terminals of this coil are connected', respectively, to the trolley T and v ground-return. A kswitch b is placed between the trolley and the primary coil. .i

- C is the secondary coil'which is located lwithin and carried by the lamp-casing A.

This secondary coil must bel so located with respect to the primary c oil and the inductive cores D that the lines of inductive force circulating through the cores and the two` coils will generate a suitable electromotive force or current in the secondary coil through the inductive eect of the alternating or interrupted current circulating through the primary coil. These primary and secondary coils and the connecting core or cores may be arranged in different ways, as indicated in the severalfigures of the drawings.y In order to secure high efficiency in the inductive core of the lamp, the adjacent ends of the separable core may be formed with spaced-apart teeth d, so that they will interlock when placed together, as .clearly' shown in Fig. 6. When thelarnp-ca'sing A is removed from the lcardash, the connection between the two coils is broken.

vA vacuum-tube E of spherical form is suspended or located `at the focal point of a reiector e, the supporting-wires e e2 being secured tothe top and bottom of the lamp-casing. Within the latter is located a rapidlyoperating circuitinterrupter 63 which is electrically connected to the secondary coil and vacuum-tube E through the wires c', e2, e4, and e5. Y E,

In lieu of the vacuum-tube E arc-carbons F may be employed, as clearly shown in Figs. 2 and 3, (the circuit-interrupter being removed,) or an incandescent lamp G may be used, as shown in Fig. 4.

In practice a primary coil is located on each end of a car within its protective housing and No resistance is employed.`

2 4 eeaesi y motive force or currentin the secondary coil,

" plicable to the direct current by the use-of a which in turn operates the circuit-interrupter e3 and through the connectlng-wires e' e2 e4 e5 fully cha-rgesor excites the vacuum-tube, the light thereby generated `being projected for-` ward by the reflector e.

i My improved headlight-lamp is equally ap- `V rapidly-operating circuit-interrupter, (indicated at ll, Fig. `l and connected in the electricalcircnit between the` trolley and the primary coil.) This circuit-interrupter will fur-` nish an alternating or interrupted current to the primarycoil, and thereby produce an elcctromotive force in the secondary coil for operating the lamp. i

It willbe understood that I ,d'0 not restrict `myself to the exact means herein shown and described and that changes may be made without departing from the scope of my in vention. y

Iclaim 'as myinventiony l. The combination with an electric-railway car having` at its end a housing, and a primary coil located within andprojected beyond such housing, of a headlight-lamp, and a secondary coil carried by such lamp and adapted to beplaced in inductive relation to the primarycoil when the lamp is placed in its operative position, the lamp-casing having an opening therein coincident with the secondary coil, as set forth.

2. The combinationwith an electric-railway car, having at its end a housing, and a primary coil located within and projecting beyond such housing, of a headlight-lamp, and a secondary coil located within the lamp-casing, and projecting through the wall of the latter, whereby the two coils areplaced in inductive relation to each other When the lamp is in its operative position, as set forth.`

3. The combination with an electric-railway car having at its end a housing, and a primary coil loeatedwithin` such housing and having its core projecting beyond the latter,

of a headlight-lamp, a secondary coil located therein and having `its core projecting outwardly through the lamp-casing, the meeting ends of the cores having interlocking teeth; i

substantially setforth. y. i l i 4. `The combination withan electric-railway car havin ga housing,` and a primary coil located within and projecting beyond such housing, of anelectric headlightlamp having a reiiector, a secondary coil within such lamp having its core projecting beyond the lampcasing, a vacuum-tube `located in proximity to the focal point of `the reiiector,"a rapidly- `operating circuit-interrupter located in *the lamp-casing, `and electrical connections between the latter and said tube, as set forth.4

o. 'The combination `with an electricrailway car ha ving a housing mountedon its dash,

and a primary coil located within such housj .ing and having itscore projecting therefrom,

of an electric headlight-lamp designed to be n hung on such dash, andhaving an .opening in its casing designed to aline with such primary coil, a secondary coil located within the lamp-casing in line with said opening so as to be placedin inductive relation to the primary coil when the lamp is positionedon the car-dash, as set forth..`

(il. The combination with an electric-railiway car, of an inductive coil located atthe end of the car, a protective housing therefor, a headlight-lamp, an inductive coil carried by such lamp, and adapted to be in inductive relation to said coil on the car, when the'lainp isplaced in operative position, inductive cores for such coils, a rapidlypperating circuit-interruptcr in the lamp-casing, a vacuumtube located at the focal point of a reflector, and connections between the inductive coil of the lamp, circuit-interrupter and vacuum-tube, as set forth. i

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

HABLAN P. TELLMAN. 

